/*
 *    FloatAudioInputStream.java
 *
 *    This file is part of Tritonus: http://www.tritonus.org/
 */

/*
 *  Copyright (c) 2000 by Florian Bomers <florian@bome.com>
 *  Copyright (c) 2003 by Matthias Pfisterer
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as published
 *   by the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
|<---            this code is formatted to fit into 80 columns             --->|
*/

package org.klab.packetcast.audio;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;



/** Base class for ... .
 */
public abstract class FloatAudioInputStream
extends TSynchronousFilteredAudioInputStream
{
      private AudioFormat intermediateFloatBufferFormat;
      private FloatSampleBuffer     m_floatBuffer = null;



      public FloatAudioInputStream(AudioInputStream sourceStream, AudioFormat targetFormat)
      {
            // transform the targetFormat so that
            // FrameRate, and SampleRate match the sourceFormat
            super (sourceStream, new AudioFormat(
                         targetFormat.getEncoding(),
                         sourceStream.getFormat().getSampleRate(),
                         targetFormat.getSampleSizeInBits(),
                         targetFormat.getChannels(),
                         targetFormat.getChannels()*targetFormat.getSampleSizeInBits()/8,
                         sourceStream.getFormat().getFrameRate(),
                         targetFormat.isBigEndian()));

            int floatChannels = targetFormat.getChannels();
            intermediateFloatBufferFormat = new AudioFormat(
                  targetFormat.getEncoding(),
                  sourceStream.getFormat().getSampleRate(),
                  targetFormat.getSampleSizeInBits(),
                  floatChannels,
                  floatChannels*targetFormat.getSampleSizeInBits()/8,
                  sourceStream.getFormat().getFrameRate(),
                  targetFormat.isBigEndian());
      }



      protected int convert(byte[] inBuffer, byte[] outBuffer, int outByteOffset, int inFrameCount)
      {
            int sampleCount = inFrameCount * getOriginalStream().getFormat().getChannels();
            int byteCount = sampleCount * (getOriginalStream().getFormat().getSampleSizeInBits()/8);
            if (m_floatBuffer == null)
            {
                  m_floatBuffer = new FloatSampleBuffer();
            }
            m_floatBuffer.initFromByteArray(inBuffer, 0, byteCount, getOriginalStream().getFormat());
            convert(m_floatBuffer);
            m_floatBuffer.convertToByteArray(outBuffer, outByteOffset, intermediateFloatBufferFormat);
            return inFrameCount;
      }



      protected abstract void convert(FloatSampleBuffer buffer);
}



/*** FloatAudioInputStream.java ***/
